Have you ever consider what does it mean a HG?
If it's something clear for you,then automatically becomes harder to find it because the more specific the elements/qualities of a system/method the less options you have.
But fewer options is not necessarily bad,there a lot of bad options out there and whether you or someone else has to discard the most of them,otherwise you are getting lost inside the infinite chaos!
For today,I'd like to present you a system which claims to be the HG,several months ago I've requested to RX coded it and then test it extensively.
At a first glance seems promising,but I would not call it Holy Grail,however it's good with proper progression and stop limits.
I've tried it with flat bets,martingale and d'alembert,all of these in the programmed code.
Why don't you see for yourself what it could do for your bankroll?!